Signal lamp



FIG. 1 is a perspective view taken from the top, front and left sides of the signal lamp showing my new design;

FIG. 2 is a front elevational view of the signal lamp;

FIG. 3 is a left side view thereof, the right side view being a mirror image of the left side;

FIG. 4 is a rear elevational view thereof wherein the oval area and five circular areas are through holes for cables and screws, respectively;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a signal lamp, as shown and described. 